CN101536348B

CN101536348B - Inter-cell power control in the presence of fractional frequency reuse

Info

Publication number: CN101536348B
Application number: CN200780040587.7A
Authority: CN
Inventors: X·罗; D·P·马拉蒂; 张晓霞
Original assignee: Qualcomm Inc
Current assignee: Qualcomm Inc
Priority date: 2006-10-31
Filing date: 2007-10-30
Publication date: 2014-08-06
Anticipated expiration: 2027-10-30
Also published as: KR101112146B1; CA2664170A1; CN104254122B; KR20090084916A; WO2008055132A3; EP2605600A1; CN101536348A; JP2010508779A; US8712424B2; EP2106671A2; US20140295907A1; CN104254122A; TW200835190A; US20100105406A1; WO2008055132A2; RU2425468C2; BRPI0717362A2; JP5265559B2; US9622188B2; RU2009120510A

Abstract

System (s) and method (s) are provided for inter-cell power control in th e presence of fractional frequency reuse in a wireless communication system. Transmission power control of a terminal (210); and ensuing inter-cell inte rference mitigation, is accomplished by receiving load indicators (23Oi) fro m non-serving sectors (246i), decoding those load indicators corresponding t o the non-serving sectors that operate in the same frequency bands as the te rminal, and adjusting the transmission power according to the states of the decoded load indicators in conjunction with the associated non-serving secto r forward link signal-to-interference and-noise ratio at the terminal. The s tates of the load indicators reflect magnitudes of interference metrics with respect to threshold values. Load indicators can also be conveyed by the non-serving sector to a base station (260) serving the terminal through a bac khaul (250) communication, and said base station can schedule an adjusted tr ansmission power for the terminal.

Description

Inter-cell power control in the time there is fractional frequency reuse

The cross reference of related application

The application requires U.S. Provisional Application No.60/863 submission on October 31st, 2006, that exercise question is " INTER-CELL POWERCONTROL WITH FFR ", and 792 rights and interests, are incorporated herein by reference this provisional application in full at this.

Technical field

Following description relates generally to radio communication, more specifically, relates to the inter-cell power control in wireless communication system.

Background technology

For example, comprise the technology of dividing based on frequency division, time-division and code for the conventional art of transmission information in mobile communications network (, cellular phone network).Usually, in the case of the technology based on frequency division, calling separates based on frequency cut-in method, and wherein each calling is placed in different frequencies.In the case of the technology based on the time-division, in the frequency of specifying, give special time part of each call distribution.In the case of the technology of dividing based on code, each calling is associated with unique code and propagates in available frequency.Various technology can be supported multiple accesses of one or more user.

More specifically, technology based on frequency division is divided into different channels by frequency spectrum being split as to uniform bandwidth chunk conventionally, for example, division to the frequency band of distributing to wireless cell phone communication can be split into 30 channels, and each channel can voice-bearer session or for digital service carrying numerical data.Each channel is at every turn only to be assigned to a user.A general use modification is orthogonal frequency division technique, and it is divided into multiple orthogonal subbands by whole system bandwidth effectively.These subbands are also known as tone, carrier wave, subcarrier, frequency band and frequency channels.Each subband is associated with the subcarrier that can modulate together with data.In the case of the technology based on the time-division, band is split into sheet or time slot when continuous according to the time.Sheet when each user of channel is provided, for sending and receive information with polling mode.For example, at any given time t, provide the access to channel that continues a short pulse (burst) to user.Then, access switches to another user, and this another user is provided a short time pulse for sending and receive information." in turn " circulation continues, and final each user is provided multiple sending and receiving pulses.

The technology of dividing based on code is conventionally by sending data in available multiple frequencies of any time in a scope.Conventionally, data are carried out digitlization and expanded in available bandwidth, wherein multiple users can spread on described channel, and each user can be assigned with unique sequence code.User can send in identical broader frequency spectrum chunk, and wherein each user's signal can be expanded by its unique spreading code separately in whole bandwidth.It is shared that this technology can provide, and one or more user is sending and receiving simultaneously.This sharing can be realized by spread spectrum digital modulation, wherein user's bit stream encoded and it expanded on the channel of non-constant width with pseudo-random fashion.In order to collect specific user's bit in the mode being concerned with, receiver is designed to unique sequence code that identification is relevant and cancels randomness.

Typical cordless communication network (for example, use frequency division, time-division and code point technology) comprise one or more base station that the area of coverage is provided, and can in this area of coverage, send and receive one or more mobile terminals (for example, wireless terminal) of data.Typical base station can send that multiple data flow are broadcasted simultaneously, multicast and/or unicast services, and wherein data flow can be that mobile terminal has the data flow that independently receives interest.Mobile terminal in base station overlay area may be interested in to receive one, more than one or all by the entrained data flow of combined-flow.Equally, mobile terminal can send data to base station or another mobile terminal.This between base station and mobile terminal or between mobile terminal communicated by letter and may be worsened because of channel variation and/or interference power variations.For example, above-mentioned variation can affect base station scheduling, power control and/or the rate prediction for one or more mobile terminal.

Above-mentioned communication relies on limited bandwidth, and it impels and utilize various schemes by extremely multiple terminals of service extension in the time keeping acceptable interference level.A kind of in these schemes is the frequency reuse of reusing adopting much smaller than 1, and wherein a large amount of contiguous communities communicate with different frequency bands.But, in order to use better system bandwidth and to increase for example peak data rate and capacity, use fractional frequency reuse (FFR), wherein can distribute one group of frequency band to carry out the operation for different adjacent cell/sectors.Therefore,, in order to improve communication, exist slow down presence of intercell interference and the demand that realizes inter-cell power control in the time there is FFR.

Summary of the invention

For the basic comprehension of some aspects to the disclosed embodiments is provided, provide the simplified summary of these embodiment below.This summary part is not a detailed summary, and it is neither will determine key or important composition element neither be depicted the protection range of these embodiment.Its object is to present with simple form some concepts of described embodiment, using this as the foreword part of more specifically describing presenting after a while.

According on the one hand, disclose a kind ofly for generate the method for load designator at wireless communication system, the method comprises: monitor the interference metric relevant to the interference that is derived from wireless communication sector; Whether exceed threshold value according to interference metric, determine load designator; And transmission load designator.

According on the other hand, detailed description herein discloses a kind of device operating in wireless communication system, comprising: for determining the module of the interference metric relevant to the interference that is derived from wireless communication sector; For generate the module of the load designator being associated with interference metric at time-frequency resources; For receiving the module of one group of load designator; And the module of distributing for dispatching power density.

According to another method, a kind of Wireless Telecom Equipment is disclosed, comprise: at least one processor, it is configured to monitor the interference that is derived from one group of sector, broadcasts load indications symbol in the time that the interference metric being associated with monitored interference exceedes threshold value, transmit load designator by backhaul network communication, and the logic state of the load designator based on received is carried out allocation of transmit power at least in part; And be coupled to the memory of at least one processor.

According to another aspect, a kind of computer program is disclosed, comprise computer-readable medium, this computer-readable medium comprises: for making the code of the interference metric that at least one computer monitoring is associated with the interference that is derived from wireless communication sector; For making at least one computer whether exceed threshold value and determine the code of load designator according to interference metric; And for making at least one computer transmit the code of load designator.

Disclosed hereinly relate on the other hand the method for contributing to carry out at wireless communication system power control, described method comprises: reception sources is from the load designator of one group of sector; The load designator corresponding with the non-serving sector of interference and noise ratio with having highest signal decoded, and described non-serving sector operates in the frequency band that is assigned to mobile terminal; And adjust the transmitted power of mobile terminal according to the state of decoded load designator.

Another aspect discloses a kind of Wireless Telecom Equipment, comprise: at least one processor, it is configured to the load designator of reception sources from one group of sector, the load designator corresponding with the non-serving sector of interference and noise ratio with having highest signal decoded, described non-serving sector and mobile terminal shared portion frequency reuse pattern, and in the time that the value of decoded load designator shows that interference metric in described non-serving sector has exceeded threshold value, reduce the transmitted power of mobile terminal; And be coupled to the memory of at least one processor.

According on the other hand, a kind of device operating in wireless communications environment is disclosed, this device comprises: for receiving the module of the load designator relevant to the size of interference metric, described load designator is derived from non-serving sector; For the module that the load designator corresponding with the non-serving sector of interference and noise ratio with having highest signal decoded, described non-serving sector operates in the fractional frequency reuse of distributing to mobile terminal; And for adjust the module of the transmitted power of mobile terminal according to the state of decoded load designator.

Another aspect discloses a kind of computer program, comprise computer-readable medium, this computer-readable medium comprises: for making at least one computer pair code that the load designator corresponding with the non-serving sector of interference and noise ratio with having highest signal decoded, described non-serving sector operates in the frequency band of distributing to mobile terminal, and this frequency band is associated with fractional frequency reuse pattern; And for making at least one computer adjust the code of the transmitted power of mobile terminal according to the value of decoded load designator.

In order to realize above-mentioned and relevant object, one or more embodiment comprise below by the feature that describes in detail and particularly point out in the claims.Explanation below and accompanying drawing describe some illustrative aspects in detail.But, the instruction of these aspects be only some modes that can use in the variety of way of general principle of the present invention.According to the detailed description providing below in conjunction with accompanying drawing, other advantage of the present invention and novel feature will become apparent, and the disclosed embodiments are intended to comprise all these aspects and their equivalent.

Brief description of the drawings

Fig. 1 is exemplified with according to the example wireless multi-address communication system of many aspects of setting forth herein;

Fig. 2 is the block diagram that contributes to carry out the example system of inter-cell power control in the time there is fractional frequency reuse;

Fig. 3 A and 3B are according to the block diagram of the exemplary embodiment of the mobile terminal of many aspects as herein described and access point;

Fig. 4 shows and adopts partial frequency multiplexing is 1/3 example wireless communications operating;

Fig. 5 A and 5B are according to the interference metric of disclosed many aspects in this paper specification and the definite schematic diagram of load designator;

Fig. 6 show according to aforementioned many aspects herein for being combined in the flow chart that exists the inter-cell power control of carrying out under fractional frequency reuse to determine the illustrative methods of load designator;

Fig. 7 shows the flow chart of the illustrative methods of power ratio control in the time there is fractional frequency reuse according to many aspects as herein described;

Fig. 8 shows according to the flow chart of the illustrative methods of passing through serving BS power ratio control of many aspects disclosed herein;

Fig. 9 A, 9B and 9C show respectively the frequency reuse table using in presence of intercell interference control simulation, the cumulative distribution of disturbing the terminal throughput of the described analog result of behavior and the power control scheme based on different;

Figure 10 is according to the block diagram of the embodiment of the transmitter system in the multiple-input and multiple-output operation deployment that cell/sector communication is provided of one or more aspect of setting forth herein and receiver system;

Figure 11 is receiving and processing load designator and adjust the block diagram of the system of transmitted power in wireless communications environment according to the many aspects of this paper specification;

Figure 12 is the block diagram that generates and transmit the system of load designator according to many aspects as herein described in wireless communications environment;

Figure 13 is exemplified with according to the block diagram that can generate the example system of load designator in radio communication of the many aspects of this specification;

Figure 14 shows according to the block diagram of the example system of can receive and decode load designator and the adjustment transmitted power of the many aspects of this specification.

Embodiment

Describe each embodiment referring now to accompanying drawing, wherein, in whole accompanying drawing, identical reference marker is used to refer to for similar elements.In the following description, for illustrative purposes, for the complete understanding to one or more embodiment is provided, many details have been provided.But, clearly, also can in the situation that there is no these details, realize these embodiment.In other example, one or more embodiment for convenience of description, known structure and equipment illustrate with block diagram.

As used in this application, term " assembly ", " module ", " system " etc. mean the entity relevant to computer, and it is combination, software, the executory software of hardware, firmware, hardware and software.For example, assembly may be, but not limited to: thread, program and/or the computer of the process moved on processor, processor, object, executable program, execution.As example, the application moving on computing equipment and computing equipment can be assemblies.One or more assemblies can reside in the process and/or thread of execution, and assembly can and/or be distributed between two or more computers in a computer.In addition, these assemblies can store the various computer-readable mediums execution of various data structures from it.These assemblies can communicate by this locality and/or remote process, for example, such as according to the signal with one or more packets (, from the data of an assembly, another assembly in this assembly and local system, distributed system carries out mutual and/or carries out alternately with other system on the network such as internet in the mode of signal) communicate.

In addition, term "or" means the "or" of pardon but not exclusive "or".,, unless otherwise pointed out or clearly shown from the context, " X uses A or B " means any self-contained displacement.That is, if X uses A, X to use B, or X uses A and B, and " X uses A or B " meets any in aforementioned so.In addition,, unless otherwise pointed out or found out it is the form of odd number from context, the article using in specification and appended claims " " should be understood to represent " one or more ".

This paper describes the multiple embodiment about wireless terminal.Wireless terminal refers to the equipment that voice and/or data connectivity are provided to user.Wireless terminal can be connected to computing equipment, and such as laptop computer or desktop computer, or it can be the autonomous device such as personal digital assistant (PDA).Wireless terminal also can be called as system, subscriber unit, subscriber station, mobile radio station, mobile terminal, mobile device, distant station, access point, remote terminal, accesses terminal, user terminal, user agent, subscriber equipment or user's set.Wireless terminal can be that subscriber station, wireless device, cell phone, pcs telephone, cordless telephone, Session initiation Protocol (SIP) phone, wireless local loop (WLL) are stood, personal digital assistant (PDA), have the handheld device of wireless connections ability or be connected to other treatment facility of radio modem.

Base station can refer to the equipment in a kind of access network, and it passes through air interface, by one or more sector, and with wireless terminal communications, and by backhaul network communication and other base station communication.By received air interface frame being converted to IP grouping, base station can be used as the router between wireless terminal and the remainder of access network, and described access network can comprise IP network.The management to air interface attribute is also coordinated in base station.In addition, multiple embodiment of this paper describe in conjunction with base station.Base station also can for mobile device communication, base station may also be referred to as access point, Node B, enode b (eNodeB) or some other terms.

With reference to the accompanying drawings, Fig. 1 is according to the diagram of the wireless multiple-access communication system 100 of many aspects.In an example, wireless multiple-access communication system 100 comprises multiple base stations 110 and multiple terminal 120.In addition, communicate by letter with one or more terminal 120 in one or more base station 110.As limiting examples, base station 110 can be access point, Node B and/or other applicable network entity.Each base station 110 provides communication overlay for specific geographic area 102a-c.As used herein and in this area, according to the context that uses term " community ", term " community " can refer to base station 110 and/or its overlay area 102a-c.

In order to improve power system capacity, overlay area 102a, the 102b corresponding with base station 110 or 102c can be divided into multiple less regions (for example, region 104a, 104b and 104c).Each less region 104a, 104b and 104c can provide service by base station transceiver subsystem (BTS, not shown) separately.As used herein and in this area, according to the context that uses term " sector ", term " sector " refers to BTS and/or its overlay area.In an example, sector 104a, 104b in community 102a, 102b and 102c and 104c can be made up of many groups antenna (not shown) at 110 places, base station, and a part and terminal 120 that wherein every group of antenna is responsible in community 102a, 102b or 102c communicate.For example, the base station 110 of serving community 102a can have first antenna sets corresponding with sector 104a, second antenna sets corresponding with sector 104b, and the third antenna group corresponding with sector 104c.But, should be understood that, various aspects disclosed herein can be used for having in the system of sectorization and/or non-sectorized cells.In addition, should be understood that, within all applicable cordless communication network with any amount sectorization and/or non-sectorized cells is intended to fall into the scope of claims.For the sake of simplicity, the station that term used herein " base station " can refer to serve the station of sector and serve community.As further used herein, " service " access point is an access point that carries out uplink service (data) transmission with terminal room, and " neighbours " (non-service) access point is to carry out downlink traffic transmission and/or downlink control transmission and up link control transmission with terminal room, but an access point that does not carry out uplink service transmission.As used herein, should be understood that, the downlink sector separating under link situation is neighbours sectors.Although for the sake of simplicity, the following describes and relate generally to the system that wherein each terminal is communicated by letter with a Service Access Point, should be understood that, terminal can be communicated by letter with the Service Access Point of any amount.

According to an aspect, terminal 120 can be dispersed in whole system 100.Each terminal 120 can be that fix or mobile.As limiting examples, terminal 120 can be access terminal (AT), mobile radio station, user's set, subscriber station and/or other applicable network entity.Terminal 120 can be wireless device, cell phone, personal digital assistant (PDA), radio modem, handheld device or other applicable equipment.In addition, terminal 120 can, in any given moment, be communicated by letter or not communicate by letter with base station 110 with the base station 110 of any amount.

In another example, system 100 can be by utilizing centralized architecture and coordinating and control for base station 110 provides with system controller 130, and this system controller 130 can be coupled to one or more base station 110.According to interchangeable aspect, system controller 130 can be single network entity or collection of network entities.In addition, system 100 can utilize distributed architecture to allow base station 110 to communicate each other as required.Backhaul network communication 135 can be to help the point to point link between the base station of this distributed architecture of use.In an example, system controller 130 can also be included in one or more connection of multiple networks.These networks can comprise internet, other packet-based network and/or circuit-switched voice network, its in system 100 with one/or multiple base station 110 information of going to and/or carrying out self terminal 120 is provided while communicating by letter.In another example, system controller 130 can comprise or with can dispatch the scheduler (not shown) coupling of going to and/or carrying out the transmission of self terminal 120.Or scheduler may reside in each independent community 102, each sector 104 and combination thereof.

In an example, system 100 can adopt one or more multiple access schemes, such as CDMA, TDMA, FDMA, OFDMA, Single Carrier Frequency Division Multiple Access (SC-FDMA) and/or other applicable multiple access scheme.TDMA adopt time division multiplexing (TDM), wherein the transmission of different terminals 120 by different time interval send and by orthogonalization.FDMA adopt frequency division multiplexing (FDM), wherein the transmission of different terminals 120 by different frequency subcarrier send and by orthogonalization.In an example, TDMA and FDMA system also can be used code division multiplexing (CDM), wherein the transmission of multiple terminals (for example can be used different orthogonal codes, Walsh code) and by orthogonalization, even if they send in same time interval or in identical frequency sub-carrier.OFDMA adopts OFDM (OFDM), and SC-FDMA adopts single carrier frequency division multiplexing (SC-FDM).OFDM and SC-FDM can be divided into system bandwidth multiple orthogonal sub-carriers (for example, sound, frequency band), and each orthogonal sub-carriers can adopt data to modulate.Conventionally, modulation symbol adopts OFDM to send in frequency domain, and in time domain, adopts SC-FDM to send.Additionally and/or alternatively, system bandwidth can be divided into one or more frequency carriers, and each frequency carrier can comprise one or more subcarriers.System 100 also can adopt the combination of multiple access scheme, such as OFDMA and CDMA.Although power control techniques provided in this article is generally described for OFDMA system, should be understood that, the techniques described herein can be applied to any wireless communication system equally.

In another example, the base station 110 in system 100 and terminal 120 can be used one or more data channels to transmit data, and use one or more control channels to transmit signaling.The data channel that system 100 is used can be assigned to active terminal 120, and each data channel is only being used by a terminal arbitrarily preset time.Or data channel can be assigned to multiple terminals 120, it can overlapping or orthogonal scheduling on data channel.In order to save system resource, the control channel that system 100 is utilized also can be shared by using such as code division multiplexing between multiple terminals 120.In an example, compare with corresponding control channel, only frequency and on the time data channel (for example, not using CDM to carry out multiplexing data channel) of orthogonal multiplex be not more vulnerable to the impact of losing because of the orthogonality that channel condition and receiver imperfection cause.

Fig. 2 is the block diagram that contributes to carry out the system 200 of inter-cell power control under fractional frequency reuse (FFR).Subscriber equipment 210 adopts fractional frequency reuse to operate, and re-use pattern therefor (or reusing table) obtains in synchronizing process, or receives from serving node B by down link.Terminal 210 can be from multiple neighbours' non-serving node B 230 ₁-230 _nreceiving downlink signal.Each in these base stations is served neighbours sector (it can be also the Serving cell that depends on sector feature).According to the interference level in neighbours sector, non-serving node B 230 ₁-230 _nbroadcasts load indications symbol 246 respectively ₁-246 _n.Should be understood that non-serving node B 230 ₁-230 _ncan communicate by letter 250 by load designator 246 by backhaul network ₁-246 _nbe sent to serving node B 260.Communicating by letter with forming with the broadcast downlink being undertaken by air interface contrasts, and this backhaul communication is the transmission of the node-to-node on service provider backbone network.The load designator (for example, 246 of broadcasting ₁-246 _n) process at user's set 210 places, the transmitted power of terminal is adjusted to realize desired interference level at non-serving sector place.Load designator (for example 246 ₁-264 _n) to the backhaul communication 250 of serving node B 260, this causes processing at this Nodes, it guarantees load designator 246 to be relayed to terminal 210 by air interface or by power division (reallocation) 276.The power that is used to send by user's set 210 is controlled in power reallocation 276 clearly.Note, node-to-node backhaul communication also can occur in non-serving base stations (230 ₁-230 _n) between.To note, in order illustrating and clear, in this description, to have provided non-serving node B 230 ₁-230 _nand the difference between serving node B 260 in function, and service and non-serving base stations function are separately shared between above-mentioned base station.The generation of load designator and processing thereof are below obtaining more detailed discussion.

For example, at non-serving node B (, 230 _j), the interference metric that load designator maker assembly 234 is determined in the neighbours sector being associated with non-serving node B.By this interference metric and threshold value (or tolerance) interference metric values I _tHcompare, then generate load designator (for example, load designator 246 _j), and send this load designator by air interface (down link) or for example, by backhaul network (, 250).In one aspect, when interference metric is higher than I _tHtime, the load designator that sending value is "True", otherwise, the instruction of transmission " vacation ".Note, adopting in the system of fractional frequency reuse, the sub band structure of FFR pattern that can be based on service and non-serving sector, determines different interference metric threshold values (below seeing) for different sub-band.Should be understood that, some factors can be determined I _tH, and these factors can be determined by service provider conventionally: such as complexity and the cost etc. of target peak data rate, target spectrum efficiency, target time delay, base station/access point.Interference can be with respect to reference value I _rEFmeasure this reference value I taking dB as unit _rEFcan utilize such as other sources of the thermal noise in system and system noise and determine.

The interference metric of sector can be the average interference of thermal noise (IoT), signal-to-jamming ratio, signal to noise ratio (SNR) or signal and noise and interference ratio (SINR).This mean value can be for example, in different frequency resource (subband and subcarrier) and time resource (such as frame and superframe) upper definite.Can be by following because usually determining about the granular level frequency time source of interferometry and that guarantee to disturb mean value: (a) internal factor, such as time and the frequency resolution of the instrument/electronic instrument for measurements interference; Or (b) external factor, the dynamic reallocation of the fractional frequency reuse pattern of for example particular terminal (for example, user's set 210).Should be understood that, the FFR pattern of the FFR pattern of sectors/cells and the terminal being associated that operates on this sectors/cells can be sent to non-service neighbor base stations (for example, 230 via backhaul network communication ₁-230 _n).The processor 238 that is coupled to load designator maker assembly 234 can be treated to sets up the necessary part calculating of interference metric.Memory 242 can preserve interference metric values, for determining the algorithm of this value and other is for determining the operating data/instruction of interference metric and load designator.

As mentioned above, UE 210 adopts fractional frequency reuse to operate.In this radio communication is disposed, available system bandwidth is divided into N frequency " chunk ", and n chunk in these chunks is available for terminal 210.Chunk is conventionally corresponding to one group of subband (wherein each subband comprises one group of subcarrier).As below disclosed, mobile device 210 is decoded to the load designator from non-serving sector, and described non-serving sector can utilize the frequency being included in n chunk distributing to mobile device.With respect to conventional method, this frequency is differentiated and has been strengthened power control, because for example, mainly the non-service cell operating in the frequency subband identical at the frequency subband operating with this mobile device is produced and disturbed from the transmission of mobile device (UE 210).Note, under Utopian condition, the subcarrier on subband is mutually orthogonal, thereby the subcarrier of different frequency can phase mutual interference.Under typical situation, orthogonality between subcarrier is very general, and therefore those designators for communicating by letter between terminal and non-serving sector, sending in overlapping spectral regions for the associated indicator of carrying out interference management and power control.

Loading/FFR monitoring assembly 214 is decoded to received load designator, and determines that these designators are "True" or " vacation ".(should be understood that, showing to disturb is effective designator higher than any other logic state of threshold value, for example " higher than " or " lower than ", " high " or " low " etc.) load designator corresponding to the received non-serving sector with thering is largest forward link SINR (in the available amount in terminal 210 places) (for example 246 wherein _n) make power control assembly 218 reduce transmitted power or power spectral density for the situation of "True".In the time that terminal receives the load designator of " vacation ", it increases its transmitted power or power spectral density.Should note, the decoding that the binary condition of the common load designator that adopts individual bit transmission in control channel is carried out, makes the mobile terminal (for example UE 210) of decoding must know the fractional frequency reuse pattern (or implantation (implantation)) of the non-serving sector of neighbours.When this FFR pattern can (i) be caught in sectors/cells by acquisition for mobile terminal, for example, once or (ii) FFR pattern that the serving node B of mobile terminal (, 260) is used to the non-serving sector of neighbours by backhaul network communications reception is just sent to mobile terminal.Note, under normal circumstances, the non-service of nearest neighbours FFR pattern needs, and this is because a little less than the signal that transmit inferior near neighbours and non-serving sector.The necessity of knowing multiple FFR patterns has increased processing expenditure; But the performance improvement on power control and interference management has compensated this expense (below seeing).In addition, this pattern for example can be stored in, in the memory (, 226) of mobile device.Note, when the load designator of neighbours sector via backhaul communication (for example, 250) transmit and at serving BS (for example, 260) while processing, for example, if mobile terminal (, 210) transmitted power will be dispatched by serving BS, and this mobile terminal can not need to understand the FFR pattern after scheduling.

About the response of the designator to "True", power reduces and can in open loop control loop, occur, wherein power has been reduced offset Δ P (I), and this offset Δ P (I) depends on interference metric values I or can be constant predetermined amount Δ P (I)=Δ P ₀, for example 0.25dBm, and UE does not ask the feedback of disturbing to be measured.Alternatively, the feedback that control loop can disturb by request after power reduces is closed.Should be understood that the expense of introducing at control loop by used and to for guaranteeing that actual interference suppresses lower than I _tHcompromise to existing between the optimization of Δ P (I): closed-loop control can reach the optimal level of interference in less control step; But, each feedback step requires each sector measurements interference after power reduces step of the load designator of sending "True", the incompatible level of qos parameter that this can be increased to the not enough level of the application (for example, game on line, video conference, video broadcasting) carried out for terminal 210 communication delay or set up with operator.On the other hand, open loop control loop is not asked measurements interference, reduces step to reach satisfied interference level but this control can cause the power of excessive number, and it also can cause the communication degradation relevant to time delay.

About increased power, fixing skew increment Delta P ' can be suitable.In order to reduce complexity, Δ P ' can equal Δ P ₀.

Fig. 3 A is exemplified with relying on policy store equipment 310 and artificial intelligence (AI) assembly 320 to determine the block diagram 300 of the base station of the generation of load designator.Policy store equipment 310 comprises the strategy that interference metric is carried out to definite time interval Δ t for determining, and the size of the interference metric threshold value that will apply in the time generating load designator.Strategy can be determined the threshold value of the each subband using in FFR pattern, or average threshold (below seeing) on subband.The historical data that should be noted that the system responses that strategy can be based on to interference management changes in a period of time; Change is adaptivity, for example, it is implemented to optimize this strategy to realize the interference control of higher level conventionally, such as the reduction of the fluctuation of the sector target proximity for determined interference metric, shorter arrival object time (initial adjustment time period in control procedure, it is controlled amount to be urged to from the state of a control starting to approach the size of desired value necessary) etc.Strategy can be communicated by letter and 250 between different sectors, be shifted by backhaul network.Should be understood that, for example, for generating load designator, different neighbor base stations (, 230 based on interference metric ₁-230 _n) can there is different strategies; Thereby, be not that all non-serving base stations transmit load designator 246 simultaneously ₁-246 _n.It is also to be understood that, although policy store equipment 310 is illustrated as separate, stored parts, it can partly or entirely be arranged in memory 242.

AI assembly 320 can be collected the historical data of interference metric, and based on communication many aspects, infer/planning (project) interference level; The many aspects of described communication such as be number of users in community, user type (for example, data-intensive user, delay-sensitive user, the user of cycle of activity with prolongation or fragmentary user), weather and geographical conditions and season condition, such as the leaf increasing in community spring, the rain in summer, the heavy snow in winter etc.Reasoning/the planning of interference metric can be based on many agencies (agent) modeling or game theory, and other advanced mathematical algorithm (below seeing).Based on planned interference metric, AI assembly 320 can change the strategy for generating load designator.Amended strategy can be asked base station (for example, non-serving node B J 230 _j) determine interference metric at specific interval, and reduce or increase those time intervals during the specific time period (special time in a day, month or a year), even within the specific time period, end to measure.In addition, amended strategy can change the size of the interference metric threshold value of the subband that sector operates therein, thus the threshold value becoming while causing.

As other parts above and are herein used, term " intelligence " refers to based on the existing information inference about system or relevant (for example, the inferring) system that draws is current or the ability of state in the future.Artificial intelligence can be for identify specific environment or action in the situation that there is no human intervention, or the probability distribution of the particular state of generation system.Artificial intelligence relies on advanced mathematical algorithm is applied to the one group of available data (information) in system, for example, and decision tree, neural net, regression analysis, cluster analysis, genetic algorithm and intensified learning.

Especially, for complete with the policy-related (noun) above-mentioned multiple automations aspect generating for load designator and with the innovation of theme described herein relevant other automation aspects, AI assembly (for example, assembly 320) can carry out learning data with in several different methods, and then from the model of following structure, draw inference, for example hidden markov model (HMM) and depend on the model of relevant prototype, more general probability graphical model, for example Bayesian network, for example, Bayesian network is by using Bayesian model scoring or approximate, such as the linear classifier of support vector mechanism (SVM) with such as the Nonlinear Classifier that is called as " neural net " method, the search structure of other method that fuzzy logic method and executing data merge creates.

Fig. 3 B is the block diagram 350 with the mobile terminal of power control assembly, and wherein this power control assembly depends on artificial intelligence component and infers optimum power adjustment/control algolithm.As previously mentioned, control algolithm can comprise Open loop and closed loop control loop, and it relates to power adjustment, and this power adjustment can be depended on the interference metric size that is used for determining load designator, or can be constant offset amount.In addition, at least the application-specific based on being carried out by UE 210 and/or the data that sent by user's set 210 are inferred in power adjustment.According to one side, compared with the situation of the application that can be lost/stop by (temporarily) for user non-key and communication session with data integrity wherein, carry out therein the sector of the application (such as wireless network goes to bank) to data sensitive for terminal, its power adjustment may be more radical, for example, larger power is adjusted side-play amount.According on the other hand, the various relations between power adjustment and interference metric size, and algorithm based on interference metric, can depend on existing interference range in sector and use.These algorithms can reside in algorithm stores equipment 360.Should be understood that, although in embodiment 350, algorithm stores equipment is the individual components that is arranged in power control assembly 218, and memory device 360 can partly or entirely be arranged in the memory 226 of UE.

Artificial intelligence component 370 can be inferred power adjustment based on above-mentioned various variablees.Based on machine learning techniques, AI assembly 370 can determine that optimum power offset is suppressed at the interference causing in neighbours sector.May increase complexity although AI assembly is increased to mobile terminal, infer that the advantage of optimal power adjustment has compensated the cost relevant to this complexity.For the complexity increasing, can use multi-core processor (for example processor 222) to process the computation requirement that operates AI assembly in operation UE.Should be understood that, other substituted systems structures of processor 222 can for example, for operating AI assembly (, 370) effectively.In addition, depend on the application of being carried out by terminal 210, in the time that the graphical user interface in phone is not used energetically, such as being in the case of only having voice communication or have market demand of low frequency display refresh rates etc., the display graphics processing unit of terminal can operate AI assembly.

Fig. 4 is exemplified with system 400, and it comprises having the sectorization wireless communication cell that fractional frequency reuse is n/N=1/3, wherein load designator is decoded/it is responded terminal selectively.Each community 402-408 is (by base station BS ₁-BS ₄(420 ₁-420 ₄) serve) be divided into 3 sectors 410 ₁-410 ₃, the each sector in these sectors operates in single frequency chunk (subband), and this single frequency chunk utilizes distinguishing filling to illustrate in graphic mode in each sector 4101-4103.Note, although only show 3, the sectorization of higher degree is possible.Sector 1410 ₁at subband σ ₁-σ ₄(430 ₁-430 ₄) middle operation, sector 2410 ₂at subband σ ₅-σ ₈(430 ₅-430 ₈) middle operation, sector 3 is at subband σ ₉-σ ₁₂(430 ₉-430 ₁₂) middle operation.Meticulous or the rough sub-band division of available BW is possible.Base station BS ₁420 ₁the terminal 440 of serving can receive or " intercepting " from the load designator of non-serving sector 1,2 and 3 (adopting arrow instruction); But, because any frequency band σ that UE 340 does not use in sector 2 and 3 ₁-σ ₈middle operation, thus this terminal can not decode/respond (dotted arrow) being derived from the load designator of sector 2 and 3, even these sectors may excess loads and they can be very large at the relevant FL SINR of UE 440.

As mentioned above, FFR pattern 410 ₁-410 ₃can in time interval Δ τ 450, be maintained with corresponding frequency, after this time interval, can determine new FFR pattern by the base station of serving each sector.Variation during FFR pattern changes can relate in response to the establishment of new sector heavily divides available system bandwidth; Increase/reduce this reusing; Or be switched to larger bandwidth operation, and use the subband recently increasing to carry out application-specific for particular terminal, for example, terminal downloads file or terminal are carried out fluidization treatment to video.Note, the result of upgrading as FFR, terminal 440 can change the load designator that it is decoded.

Fig. 5 A shows fractional frequency reuse pattern and determining the interference metric for power control.Show centralized (localized) FFR and remove centralized (delocalized) FFR.The span of each in these FFR patterns is a time interval Δ τ 450.In these two FFR examples, system bandwidth is divided into M subband, and N sector is assigned n=4 subband, thereby causes reusing of 4/M.Should be understood that, given n=4 is that and nonrestrictive, other selection of n is also fine for the reason of explanation and elaboration, and within the protection range of described specification.In centralized FFR, the subband of distributing to sector is continuous and occupies specific frequency interval, and going in centralized FFR, subband interweaves.Should be understood that, the each subband in Fig. 5 A can comprise G subcarrier.Interference metric { I _{σ; s}510 ₁-510 _mwith 520 ₁-520 _mrelevant to subband σ and corresponding sector S.For example, set { I _{m-7; N-1}510 _m-7, I _{m-6; N-1}510 _m-6, I _{m-5; N-1}510 _m-5, I _{m-4; N-1}510 _m-4comprising the interference metric of subband M-7 to M-4, it is corresponding to sector N-1, and gathers { I _{m; N}520 _m, I _{k+3; N}520 _k+3, I _{p+3; N}520 _p+3, I _{4; N}520 ₄.Should be appreciated that interference metric 510 ₁-510 _mwith 520 ₁-520 _min each can be corresponding to the mean value on multiple subcarriers, as previously discussed, this mean value can produce according to the resolution for determining the instrument disturbing.

According to an aspect, the interference metric for example, being associated with the subband of distributing to sector S (sector N) is averaged, thereby produce mean value for centralized FFR _{1; L}415 ₁- _{n; L}515 _nwith for going centralized FFR to produce mean value _{1; D}525 ₁- _{n; D}525 _n.This mean value can be used for and interference threshold I _tHcompare, and interference metric in definite sector is higher than threshold value or lower than threshold value.Should be understood that, the mean value of interference metric can be interior definite at time interval Δ τ ', and this time interval, Δ τ ' was shorter than Δ τ 450.As an example, interference can be detected at subband with set rate, and for example every specific quantity frame carries out one-shot measurement, for example, such as each radio frames or superframe (,, at LTE, the span of radio frames is 10 seconds).Detection rate can be adjusted according to various parameters, and described parameter is such as being cell load and/or business, channel condition etc.

Subband is (such as 515 ₁-515 _nwith 525 ₁-525 _n) on the mean value of interference metric can be arithmetic mean, geometrical mean or harmonic-mean.Each in these sub-band averaging values can be weighted average; For example, in arithmetic mean, at definite mean value _{s; a}(a=L, D) before, the each subband interference metric I relevant to sector S _{σ; S}be multiplied by weight w _{σ; S}, this weight is scalar.These mean values can be calculated by processor 238.Should be understood that weight w _{σ; S}can allow taking into account system factor, such as the instrument response in the time determining interference metric, for example in particular frequency range, the definite of the interference metric to subband is to adopt than surveying in the low accuracy of other frequency range.Weight w _{σ; S}on the frequency band of distributing to sector S, be normalized to one, and weight w _{σ; S}depend on frequency, time, channel condition, sector load and business etc.According to an aspect, weight can for example, the history value based on weight be determined/infer with history or current data that other can be used for inferring or analyzing by AI assembly (, assembly 320).

Fig. 5 B for example shows, according to the interference metric threshold value of frequency subband and logical value separately (, "true" or "false").Each subband 430 ₁-430 _mthere is interference metric threshold value I _tH560 ₁-560 _m, it affects the scope of the interference metric corresponding with "True"/" vacation " load designator.Subband threshold value can cause the average threshold 570 ₁-570 _m.These mean values can be calculated by processor 238.Should be understood that, such being averaging can and go centralized FFR to carry out for centralized FFR.Sub-band averaging value 570 ₁-570 _nin each can indicate the logic state of load designator.Along with the carrying out of time, threshold value 560 ₁-560 _mwith average threshold 570 ₁-570 _mcan change to be reflected in communication sector (as 410 ₁-410 ₃) in the new FFR that works reuse.Should be understood that mean value 570 ₁-570 _mcan be and available frequency resource (for example, 510 ₁-510 _m) arithmetic, geometry or the harmonic-mean of relevant threshold value.In addition, described mean value can be weighted average, and the described weight that wherein enters the process of being averaging is to determine according to the useful history value of weight.Note, due to interference metric threshold value I _tH560 ₁-560 _min the time for the big or small strategy of determining interference metric threshold value being, become, so average threshold 570 ₁-570 _malso while being, become.

In view of the example system that provides above and describe, with reference to the flow chart of Fig. 6-8, will understand better the method for the inter-cell power control realizing according to theme described herein.Although, for the object of simplified illustration, described method is shown and described as a series of square frames, but should be appreciated that and understand be, desired theme is not limited to numbering or the order of square frame, because some square frames can occur and/or occur with other square frame of describing herein and describe with different order simultaneously.And the method realizing hereinafter described not need to all exemplary square frames.Should be appreciated that, the function being associated with these square frames can for example, by software, hardware or its combination and any other suitable module (, equipment, system, process, assembly ...) realize.In addition, it is also to be understood that, after and in whole specification disclosed method can be stored in goods, to help these methods are transmitted and transferred in various device.Those skilled in the art will understand and understand, alternatively, method can be expressed as a series of state or events of being mutually related, such as in state diagram.

Fig. 6 has provided the flow chart of determining the method 600 of load designator under fractional frequency reuse in conjunction with presence of intercell interference.610, interference metric is monitored.Interference metric (for example, disturbing and thermal noise ratio, signal-to-jamming ratio, signal to noise ratio, signal and noise and interference ratio etc.) is relevant with the interference that is derived from one group of sector.Conventionally the terminal, sending with the power that improves or power spectrum density is to cause the reason of the interference being generated.620, with respect to threshold value, the size based on described interference metric is determined load designator: if interference metric exceedes threshold value, load designator adopts logic state to reflect this relation, such as "True".Equally, if interference metric, lower than threshold value, can be distributed to load designator by logic state " vacation ".According to an aspect, interference metric can determine according to frequency, and for example interference metric is (the seeing Fig. 5 A) determined in the particular sub-band in frequency domain.Similarly, interference metric can be determined according to the time, for example frame, superframe.According on the other hand, interference metric can be the mean value of specific time-frequency resources collection.Should be understood that, due to experimental precision, even accurate interferometry also relates to the mean value on several subcarriers and frame, instead of survey single sub-carrier in single frame.

630, load designator is transmitted.Possible for two possible paths of transmitting: (i) by air interface, for example, by base station (, the non-serving node B 1230 for determining load designator ₁) broadcast, and (ii) send load designator by backhaul network.According to an aspect, mechanism (i) shows the transmission to load designator and for example, communication delay between the reception of non-service terminal (, UE 440) produces the advantage of faint impact.Lack significant time delay, this has improved about the size of the interference metric relevant to reducing load designator and the response time of the power control of essential end.Mechanism (ii) provides the insensitive advantage of channel condition, because by wired or fiber shaft network, communication for example, in base station (, 230 ₁and 260) between, be point-to-point, described wired or fiber shaft network use communication link, such as link and/or the packet-based Internet protocol of T1/E1 circuit or other T carrier wave/E carrier protocol.Can guarantee that to the insensitive of channel condition load designator is correctly received and processes, guarantee to reduce the required power adjustment of interference simultaneously.But, should be understood that, the backhaul communication of load designator may cause significant time delay.However,, according to the performed application of terminal, can tolerate power adjustment and the interference time delay in controlling/alleviating.

Fig. 7 has provided the flow chart of the method 700 of the inter-cell power control under fractional frequency reuse.710, terminal (for example, UE 440) reception sources for example, from load designator (, the load designator 246 of the strongest non-serving sector _j) and it is decoded, wherein this non-serving sector operates in the frequency band of distributing to terminal.The requirement operating in the frequency band that non-serving sector is operated in terminal, allows fractional frequency reuse to be attached in inter-cell power control.This frequency identification (discrimination) makes terminal can process the load designator of following sector, and in this sector, terminal can actually cause significant interference." the strongest " non-serving sector is corresponding to the non-serving base stations that adopts best channel condition to send to terminal, and described best channel condition is for example the highest SINR in down link (or forward link) transmission.According to an aspect, when the forward link SINR of multiple non-serving base stations is basic identical or within range of tolerable variance time, terminal can be decoded to the load designator of the plurality of non-serving sector, and by consider those non-serving sectors forward link SINR (for example, find out the weighted average of load designator using forward link SINR as corresponding weight, then these weighted average and threshold value are compared to generate actual loading designator) and/or other characteristic of the communication condition of non-serving sector, such as the number of users in the community of being served by the sector that sends load designator, determine the pay(useful) load designator after the combination corresponding with power.Note, this actual loading designator replaces the load designator being associated with the strongest non-serving sector.720, the logic state of verification load designator (for example, exceeding in received interference metric under the situation of threshold value is "True", or above-mentioned tolerance is lower than being " vacation " under the situation of threshold value).730, if load designator is "True", terminal reduces its transmitted power spectral density (PSD) level, and 740, if load designator is " vacation ", terminal increases its PSD level.According to an aspect, this power control can be passed through power control assembly, such as assembly 218, in terminal, realizes.

Fig. 8 has provided the flow chart that carries out the method 800 of inter-cell power control by serving BS.810, one group of load designator sending by the non-serving sector of backhaul network communications reception neighbours.For example, because communication occurs on wired (, twisted-pair feeder, optical fiber etc.) backbone network, so even under noisy channels condition, this communication also allows the non-serving sector in a distant place to transmit load designator.According to an aspect, this communication can be based on packet switching, Internet protocol (IP) (this is the situation in UMB).820, received load designator is processed/decoded, determine the designator that produces from sector and their logic state, wherein said sector for example, distributing in serving sector (410 ₁) in for example, operate in the identical frequency subband of terminal (440) of operation.830, transmit the pay(useful) load designator after combination by air interface, pay(useful) load designator after this combination considers that for example, described strong non-serving sector and terminal operate in same frequency interval from the load designator of nearly all strong (, high FL SINR) non-serving sector.Or 840, new transmission PSD is assigned to terminal (for example,, by scheduler 264).This point is equipped with as above in conjunction with the similar mode of mode of the control discussion of the function of power control assembly 218 in terminal 210 and the transmitted power of UE and carries out.

Then, by simulating exemplified with the illustrative methods 700 for carry out power control under FFR.The wireless communication system of institute's modeling comprise have 3 sectors community around 19 Node B (seeing Fig. 3) in layout.Every 10ms (it is equivalent to the radio frames in LTE) surveys once and disturbs.In addition, accommodate 10 terminals in each sector, its speed is up to 3km/h and have complete buffered communication model; Each terminal is dispatched according to Proportional Fair.Under the effect of fractional frequency reuse 2/3, the system bandwidth of 5MHz is divided into 12 subband σ ₁-σ ₁₂; Each band comprises 25 subcarriers.Fig. 9 A shows the table of reusing using in simulation.Solid black circle (910) and open circle (920) represent respectively available subband and the restricted sub-band of sector.System BW is divided into N=12 chunk, and each sector 410 ₁-410 ₃be assigned n=8 subband; Distributed to paired sector for wherein four simultaneously.Should be understood that, this is reused and may cause producing the interference increasing in the sector of sharing subband, and along with the subcarrier of higher quantity is used for communication, in each sector, message transmission rate can increase.In addition, other FFR pattern can be for simulation, and its result is basic identical with the result that presented below herein.In addition, analog result hereinafter described for example, corresponding to the load designator by air interface transmission (, 246 ₁-246 _n); But, for example, transmitting in the situation of load designator by backhaul network (250), can expect identical qualitative results.

Fig. 9 B show in base station determine according to Figure 95 0 of the interference metric of time (interference adaptive).Figure 95 0 compares the performance of the inter-cell power control method that comprises FFR 700 (being marked as in this article PC-1) herein and traditional inter-cell power control algorithm (PC-2) that does not comprise FFR: in the time using traditional scheme PC-2, terminal (for example, UE 440) is known nothing the FFR pattern adopting in wireless communication system; On the contrary, algorithm PC-1 herein requires UE to know that the FFR of bottom realizes, so that optionally (in frequency domain) decodes to the suitable load designator transmitting by sector, this sector operates in the frequency subband for terminal scheduling.As mentioned above, in PC-2, terminal (such as UE 440) is decoded to the load designator being generated by the non-serving sector of its neighbours, and wherein in fact the non-serving sector of these neighbours can be used and the diverse frequency band of terminal of carrying out decoding.In this simulation, interference metric is corresponding to disturbing thermal noise (IoT), and interference metric threshold value I _tH=(IoT) _tH960 are set to 4.41dB; But, should be understood that, threshold value can be set as any other value substantially.And, even if 12 subbands can be used for communication, in simulation, also use single threshold value.On (8) subband that can use in sector, the interference metric of simulating in each sector is averaged, then with I _tH960 compare.Note, other interference metric can, for simulation, and obtain essentially identical result as shown in Figure 95 0.That is, PC-1 causes in wireless system, IoT accurately being controlled, at the adjustment time interval τ of 800 sequential nearly _minafter 970, its fluctuation for example, is in targets threshold (IoT) at least 5000 sequential (, the span of a sequential is 0.5ms in LTE) _tHin near the 4dB of=4.41dB.

According to Figure 95 0, can understand traditional uncontrollable IoT of Poewr control method PC-2: after adjustment cycle, IoT is at set threshold value I _tHnear=4.41dB 960, reach minimum value and progressively increase, demonstrating the fluctuation of approximately 6-7dB IoT mean value～8dB near, it is higher than target I _tH960.The reason that can not carry out accurately controlling is, does not have frequency identification in PC-2 scheme; Thereby, for example, by terminal (, UE 440) when load designator is decoded, this designator is not relevant to the PSD level of terminal---and this PSD level is by the transmitted power for this terminal scheduling and distribute to recently determining between the frequency of subcarrier of this terminal.By FFR pattern is attached in the processing of load designator, in PC-1, consider the PSD level of terminal.Therefore,, compared with PC-2, inter-cell power control is improved.

Fig. 9 C shows the curve chart 980 of the cumulative distribution function of the simulation of the terminal throughput of Poewr control method PC-1 disclosed herein and traditional Poewr control method PC-2.As mentioned above, in conjunction with Fig. 9 A, the wireless communication system of simulating comprises that 570 are deployed in 57 UE in sector equably.Other parameter in described simulation is with noted earlier identical.Clearly, according to Figure 98 0, the performance of algorithm PC-1 (700 in Fig. 7) is better than traditional algorithm PC-2 herein.Average sector throughput < η > to the average horizontal <IoT> of IoT and PC-1 and PC-2 in sector directly relatively shows: <IoT> ^(PC-1)=4.43dB and < η > ^(PC-1)=2.75Mbps, and <IoT> ^(PC-2)=8.06dB and < η > ^(PC-2)=2.23Mbps.Compared with traditional algorithm PC-2, power control algorithm (PC-1) herein causes the remarkable decline of interference level and the increase of sector throughput.

Summary view 9A, 9B and 9C, notice, when adopt fractional frequency reuse in the up link of wireless communication system (such as LTE) time, traditional inter-cell power control algorithm can not be worked effectively.Disclosed power control scheme causes realization under FFR at base station place, interference metric level (being illustrated by IoT) to be carried out effectively and accurately controlling, and optimizes sector throughput simultaneously.

Figure 10 is that transmitter system 1010 in multiple-input and multiple-output (MIMO) system according to one or more aspects as herein described is (such as base station 260 or BS 230 ₁-230 _nin any one) and receiver system 1050 (for example, access terminal 240) the block diagram 1000 of embodiment, wherein multi-input multi-output system can provide cell/sector communication in wireless communications environment---for example, in conjunction with Fig. 7,8 and 9 descriptions of carrying out, can carry out the inter-cell power control under FFR as above.At transmitter system 1010, the business datum of multiple data flow can offer transmission (TX) data processor 1014 from data source 1012.In one embodiment, each data flow sends by transmitting antenna separately.TX data processor 1014 is based upon the specific coding scheme that each data flow is selected, and the business datum of this data flow is formatd, is encoded and interweaves, so that coded data to be provided.Can use OFDM technology, by multiplexing to the coded data of each data flow and pilot data.The data pattern that pilot data is normally known, it is processed in known manner and can be for estimating channel response in receiver system.Then, (be for example based upon the certain modulation schemes of each data flow selection, two-phase PSK (BPSK), quarternary phase-shift keying (QPSK) (QPSK), MPSK multiple phase shift keying (M-PSK) or m rank quadrature amplitude modulation (M-QAM)) coded data of the pilot tone after multiplexing and this data flow (is for example modulated, sign map), so that modulation symbol to be provided.Data rate, coding and the modulation of each data flow can determine by the instruction of being carried out by processor 1030, and described instruction and data can be stored in memory 1032.

Then the modulation symbol of all data flow can be provided for TX MIMO processor 1020, and it can further process modulation symbol (for example,, for OFDM).TX MIMO processor 1020 is then by N _tindividual stream of modulation symbols offers N _tindividual transceiver (TMTR/RCVR) 1022 _ato 1022 _t.In a particular embodiment, TX MIMO processor 1020 is beam forming weighting (or precoding) is applied to the symbol of data flow and is just sending on the antenna of this symbol.The symbol that each transceiver 1022 receives and processes separately flows to provide one or more analog signals, and further regulate (for example, amplification, filtering and up-conversion) that the modulated signal that is suitable for transmitting on mimo channel is provided to analog signal.From transceiver 1022 _a-1022 _tn _tindividual modulated signal is then respectively from N _tindividual antenna 1024 ₁-1024 _tsend.At receiver system 1050, the modulated signal sending is by N _rindividual antenna 1052 ₁-1052 _rreceive, the signal receiving from each antenna 1052 offers corresponding transceiver (RCVR/TMTR) 1054 _a-1054 _r.Each transceiver 1054 ₁-1054 _rthe signal receiving is separately regulated to (for example, filtering, amplification and down-conversion), and the signal after regulating is carried out to digitlization provides sampling, and further processes these and sample " receiving " symbol stream that provides corresponding.

RX data processor 1060 is then from N _rindividual transceiver 1054 ₁-1054 _rreceive N _rindividual symbol stream based on specific receiver treatment technology N _rindividual received symbol stream is processed, thereby N is provided _tindividual " detecting " symbol stream.Then RX data processor 1060 carries out demodulation, deinterleaving and decoding to each detected symbol stream, to recover the business datum of data flow.The TX MIMO processor 1020 at the processing that RX data processor 1060 is performed and transmitter system 1010 places and the performed processing complementation of TX data processor 1014.Processor 1070 is periodically determined which pre-coding matrix of use, and this matrix can be stored in memory 1072.Processor 1070 is formulated reverse link message, and this reverse link message is drawn together matrix index part and order value part.Memory 1072 can be stored instruction, and in the time being carried out by processor 1070, this instruction causes formulating reverse link message.Reverse link message can comprise to communication link or received data flow or its and combines relevant various information.As an example, this information can comprise the communication resource after adjustment, for adjusting the side-play amount of dispatched resource and the information for data packet format is decoded.Then reverse link message is processed by TX data processor 1038, is modulated, by transceiver 1054 by modulator 1080 _a-1054 _rregulate, and be sent back to transmitter system 1010, wherein TX data processor 1038 also receives the business datum of multiple data flow from data source 1036.

At transmitter system 1010, from the modulated signal of receiver system 1050 by antenna 1024 ₁-1024 _treceive, by transceiver 1022 _a-1022 _tregulate, carry out demodulation by demodulator 1040, and processed by processor 1042, the reverse link message being sent to extract receiver system 1050.Then processor 1030 determine and which pre-coding matrix to determine beam forming weighting with, and the message extracted of processing.

As shown in figure 10 and according to above-described operation, the situation that alone family (SU) MIMO operator scheme is communicated by letter with transmitter system 1010 corresponding to single receiver system 1050.Should be understood that, in operator scheme herein, can realize as described above the power of minizone.In SU-MIMO system, N _tindividual transmitter 1024 ₁-1024 _t(also referred to as TX antenna) and N _rindividual receiver 1052 ₁-1052 _r(also referred to as RX antenna) forms the matrix channel (for example, Rayleigh channel or Gaussian channel) of radio communication.SU-MIMO channel is by the N of random complex _r× N _tmatrix description.The order of channel equals N _r× N _tthe algebraically order of channel.In space-time or space-frequency coding, the quantity of the data flow that order equals to send on channel and layer.Should be understood that, order equals min{N at the most _t, N _r.By N _tindividual transmit antenna and N _rthe mimo channel that individual reception antenna forms can be broken down into N _vindividual independently channel, it is also referred to as space channel, wherein N _v≤ min{N _t, N _r.N _veach in individual independently channel is corresponding to a dimension.

According to an aspect, at tone omega place, adopt the symbol of OFDM sending/receiving to carry out modeling by formula below:

y(ω)＝ H(ω)c(ω)+n(ω)。(1)

Here, y (ω) is received data flow and is N _r× 1 vector, h(ω) be the channel response N at tone omega place _r× N _tmatrix (for example, time varying channel response matrix hfourier transform), c (ω) is N _t× 1 output symbol vector, and n (ω) is N _r× 1 noise vector (for example, additive white Gaussian noise).Precoding can be by N _v× 1 layer vector converts N to _t× 1 precoding output vector.N _vthe actual quantity of the data flow (layer) that sent by transmitter 1010, N _vcan for example, under the decision of transmitter (, access point 250), the order of reporting based on channel condition and terminal is at least in part dispatched.Should be understood that, c (ω) is the result by least one multiplexing scheme of transmitter applies and at least one precoding (or beam forming) scheme.In addition, c (ω) and power gain matrix are carried out convolution, and this power gain matrix is determined and is assigned to send each data flow N _vthe quantity of power of transmitter 1010.Should be understood that, this power gain matrix can be to distribute to 240 the resource of accessing terminal, and as described herein, can manage it by Modulating Power side-play amount.In view of the FL/RL reciprocity of wireless channel, should be understood that, also can carry out modeling in the mode of formula (1) from the transmission of MIMO receiver 1050, it comprises substantially the same element.In addition, receiver 1050 also can be applied pre-coding scheme transmit data in reverse link before.

According to one or more aspect as herein described above, in system 1000 (Figure 10), work as N _t=N _r=1 o'clock, system is reduced to can provide the single-input single-output of sector communication (SISO) system in wireless communications environment.Alternatively, the many output of single input (SIMO) operator scheme is corresponding to N _t> 1 and N _r=1.In addition,, in the time that multiple receivers are communicated by letter with receiver system 1010, set up multiple users (MU) MIMO operator scheme.Can each time in aforesaid operations pattern use according to the inter-cell power control under FFR of various aspects described herein.

Figure 11 is also realizing and measuring the block diagram of the system 1100 of the power control being associated with presence of intercell interference for monitoring load designator according to many aspects as herein described.In an example, system 1100 comprises and accesses terminal 1102.As shown, accessing terminal 1102 can receive signal from one or more access points 1104 via antenna 1108, and via antenna 1108 to one or more access point 1104 transmitted signals.In addition, access terminal and 1102 can comprise for receive the receiver 1110 of information or any other electronic equipment substantially from antenna 1108.In an example, the demodulator (Demod) 1112 that receiver 1110 can be operationally carries out demodulation with the information for to received is associated.Then demodulation symbol can be analyzed by processor 1114.Processor 1114 can be coupled to memory 1116, and described memory 1116 can be stored and 1102 relevant data and/or the program codes that access terminal.In addition, access terminal and 1002 can carry out manner of execution 700 with processor 1114, and/or other applicable methods.Accessing terminal 1002 also can comprise modulator 1118, and it can carry out signal multiplexing, sends to one or more access points 1104 for transmitter 1120 via antenna 1108.

Figure 12 be according to many aspects as herein described contribute in wireless communication system, generate load designator, transmit load designator, and be the block diagram of the power level of dispatch terminal and the example system of other reverse link resources 1200.In an example, system 1200 comprises base station or access point 1202.As directed, access terminal 1202 can via receive (R _x) antenna 1206 is from one or more 1204 reception signals that access terminal, and via transmitting (T _x) antenna 1208 is sent to and one or morely accesses terminal 1204.

In addition, access point 1202 can comprise the receiver 1210 of the information for receiving from reception antenna 1206.In an example, receiver 1210 can be operationally carries out demodulation with the information for to received demodulator (Demod) 1212 or in fact any other electronic equipment are associated.Then demodulation symbol can be analyzed by processor 1214.Processor 1214 can be coupled to memory 1216, the information that described memory 1216 is can storage relevant to code clusters, the distribution that accesses terminal, relevant look-up table, unique scramble sequence and/or the information of other applicable type.Access point 1102 also can comprise modulator 1218, and described modulator 1218 can carry out signal multiplexing, is sent to and is one or morely accessed terminal 1204 by transmitting antenna 1208 for transmitter 1220.

The system of the many aspects that can realize disclosed theme then, is described in conjunction with Figure 13 and 14.Such system can comprise functional block, and it can be the functional block that represents the function for example, being realized by processor or e-machine, software or above combination (, firmware).

Figure 13 exemplified with according to various aspects of the present disclosure for generate the block diagram of the example system of load designator in radio communication.System 1300 can be positioned at wireless base station (for example, access point 230 at least in part ₁-230 _nwith 260) in.System 1300 comprises the logical combination 1310 of the electronic building brick that can work together.According to an aspect, logical combination 1310 comprises the electronic building brick 1315 for determining the interference metric relevant to the interference that is derived from wireless communication sector; For generate the electronic building brick 1325 of the load designator being associated with interference metric at time-frequency resources; For receiving the electronic building brick 1335 of one group of load designator; And the electronic building brick 1345 distributing for dispatching power density.In addition, system 1300 can comprise the electronic unit 1355 that is directly coupled to electronic building brick 1315, described electronic building brick 1355 for for settling time interval survey the strategy of the interference of sector; And being directly coupled to the electronic building brick 1365 of electronic building brick 1325, described electronic building brick 1365 is for using the strategy of one group of threshold value for set up interference metric in frequency resource.

System 1300 can also comprise memory 1370, the instruction that described memory 1370 is preserved for carrying out the function being associated with electronic building brick 1315,1325,1335,1345,1355 and 1365, and can carry out the measured data with calculating that generate between these functional periods.Although the one or more outsides that are positioned at memory 1370 that are shown as in electronic building brick 1315,1325,1335,1345,1355 and 1365, but should be appreciated that the one or more inside that can be positioned at memory 1370 in electronic building brick 1315,1325 and 1335,1345,1355 and 1365.

Figure 14 show according to various aspects of the present disclosure for receiving the decode load designator and adjusting the block diagram of example system of transmitted power.System 1400 for example can be positioned at, in wireless base station (, accessing terminal 210) at least in part.System 1400 comprises the logical combination 1410 of the electronic building brick that can work together.According to an aspect, logical combination 1410 comprises: for receiving the electronic building brick 1415 of the load designator being associated with the size of interference metric, wherein load designator is derived from non-serving sector; For electronic building brick 1425 that load designator is decoded, wherein load designator is corresponding to the non-serving sector with highest signal and noise and interference ratio, and this non-serving sector operates distributing in the fractional frequency reuse accessing terminal; And for adjust the electronic building brick 1435 of the transmitted power spectral density of mobile terminal according to the state of decoded load designator.

System 1400 can also comprise memory 1440, and it preserves the instruction for carrying out the function being associated with electronic building brick 1415,1425 and 1435, and in the data of carrying out the measured and calculating generating between these functional periods.Although the one or more outsides that are positioned at memory 1340 that are shown as in electronic building brick 1415,1425 and 1435, should be appreciated that, the one or more inside that can be positioned at memory 1440 in electronic building brick 1415,1425 and 1435.

Realize for software, the techniques described herein can utilize the module (for example, process, function etc.) for carrying out function described herein to realize.These software codes can be stored in memory cell, and are carried out by processor.Described memory cell can be realized in processor inside, also can realize the outside at processor, is realizing in the case of processor outside, and described memory cell can be coupled to processor communicatedly via various means, as known in the art.

The various aspects of feature described herein may be implemented as method, device or use the goods of standard program and/or engineering.Term used herein " goods " is intended to contain can be from the computer program of any computer readable device, carrier or medium access.For example, computer-readable medium can comprise, but be not limited to: magnetic storage apparatus (for example, hard disk, floppy disk, magnetic stripe etc.), CD (for example, compact disk (CD), digital universal disc (DVD) etc.), smart card and flash memory device (for example, EPROM, card, rod, key drive etc.).In addition, various storage medium described herein can represent one or more equipment and/or other machine readable media for the information of storing.Term " machine readable media " can include but not limited to can store, comprise and/or carry wireless channel and various other medium of instruction and/or data.

As used herein, term " processor " can refer to classical architecture or quantum computer.Classical architecture includes but not limited to comprise: single core processor, the uniprocessor with software multithreading executive capability, multi-core processor, the multi-core processor with software multithreading executive capability, the multi-core processor with hardware multithreading technology, parallel tables and have the parallel tables of distributed shared memory.In addition, processor can refer to integrated circuit, application-specific integrated circuit (ASIC) (ASIC), digital signal processor (DSP), field programmable gate array (FPGA), programmable logic controller (PLC) (PLC), CPLD (CPLD), discrete gate or transistor logic, discrete hardware components or its combination in any for carrying out function described herein.Quantum computer architecture can be based on being included in the quantum bit that adopts in door or the quantum dot of self assembly, nuclear magnetic resonance platforms, Josephson junction etc.Processor can utilize the architecture of nanoscale, such as, but not limited to, the transistor based on molecule or quantum dot, switch and door, to space is used to the performance that is optimized or strengthens user's set.Processor also can be implemented as the combination of computing equipment, the combination of combination, multi-microprocessor, one or more microprocessor and the DSP kernel of for example DSP and microprocessor, or any other this kind of structure.

In addition, in this manual, term " memory " refers to data storage device, algorithm stores equipment and other information storing device, such as, but be not limited to image storage apparatus, digital music and video storaging equipment, chart and database.Should be understood that, memory assembly as herein described can be volatile memory or nonvolatile memory, or can comprise volatile memory and nonvolatile memory the two.As example, and nonrestrictive, nonvolatile memory can comprise read-only memory (ROM), programming ROM (PROM), electrically programmable ROM (EPROM), electrically-erasable ROM (EEROM) (EEPROM) or flash memory.Volatile memory can comprise random access memory (RAM), and it is as external cache.As example and nonrestrictive, RAM can adopt various ways to obtain, such as synchronous random access memory (DRAM), dynamic ram (DRAM), synchronous dram (SDRAM), double data rate sdram (DDR SDRAM), enhancing SDRAM (ESDRAM), synchronization links DRAM (SLDRAM) and direct RambusRAM (DRRAM).In addition, the memory assembly of system disclosed herein and/or method is intended to include, but not limited to the memory of these and other applicable types.

Description above comprises the example of one or more embodiment.Certainly, all possible combination of describing assembly or method in order to describe these embodiment is impossible, but one skilled in the art would recognize that and can carry out many further combinations and displacement to these embodiment.Therefore, described embodiment is intended to contain the changes, modifications and variations in all spirit and protection ranges that fall into appended claims.In addition, with regard to the term using in specification or claims " comprises ", the mode that contains of this term is similar to term and " comprises ", just as term " comprise " in the claims explain as link word.

Claims

1. for generate a method for load designator at wireless communication system, described method comprises:

The interference metric that monitoring is associated with the interference that is derived from the wireless communication sector in one or more subbands;

Infer interference metric threshold strategies according to the historical data of the wireless communication system response for interference management, wherein each subband has interference metric threshold value, and the sub band structure of fractional frequency reuse (FFR) pattern based on service and non-serving sector, determines different interference metric threshold values for different subbands;

Whether exceed described interference metric threshold value and determine the load designator of wireless communication sector according to described interference metric; And

Transmit described load designator.

2. method according to claim 1, described interference metric is at least one in interference-to-noise ratio, signal to noise ratio, signal-to-jamming ratio and signal and interference and noise ratio.

3. method according to claim 2, wherein, described interference metric is definite for time resource, and described time resource is at least one in frame or superframe.

4. method according to claim 1, wherein, described interference metric is mean value in time.

5. method according to claim 4, wherein, described mean value is weighted arithmetic average, and weight is that history value or the particular value of the time-frequency resources based on obtaining mean value thereon at least in part determined.

6. method according to claim 4, wherein, described mean value is weighted harmonic mean value, wherein weight is at least to determine based on historical weighted value or other history or current data that can be used for inferring or analyzing.

7. method according to claim 4, described mean value is geometrical mean.

8. method according to claim 6, wherein, described threshold value is the mean value in temporal frequency resource.

9. method according to claim 1, wherein, described strategy is that sector is distinctive.

10. method according to claim 1, wherein, described strategy be self adaptation and time become.

11. methods according to claim 1, wherein, are delivered to described strategy multiple different sectors from the first sector by backhaul network communication.

12. methods according to claim 1, wherein, load designator presentation logic binary condition.

13. methods according to claim 1, wherein, the step that transmits described load designator comprises by air interface broadcasts described load designator.

14. methods according to claim 1, wherein, the step that transmits described load designator is included in load designator described in backhaul communication transmission over networks.

15. methods according to claim 1, also comprise to by backhaul network communications reception to one group of load designator process.

16. methods according to claim 15, wherein, the step of processing one group of load designator comprises a class frequency resource of determining corresponding to the FFR being associated with described load designator.

17. methods according to claim 16, also comprise load designator and this class frequency scheduling of resource transmit power assignment based on received.

18. 1 kinds generate the device of load designator, comprising in wireless communication system:

For monitoring the module of the interference metric being associated with the interference being derived from the wireless communication sector of one or more subbands;

Historical data for the wireless communication system response based on to interference management is inferred interference metric threshold strategies module, wherein each subband has interference metric threshold value, and the sub band structure of fractional frequency reuse (FFR) pattern based on service and non-serving sector, determines different interference metric threshold values for different subbands;

Determine the module of the load designator of wireless communication sector for whether exceeding described interference metric threshold value according to described interference metric; And

For transmitting the module of this load designator.

19. devices according to claim 18, wherein, described interference metric is at least one in following: interference-to-noise ratio, signal to noise ratio, signal-to-jamming ratio and signal and interference and noise ratio.

20. devices according to claim 18, wherein, usage policy is that different frequency resources is set up interference metric threshold value.

21. devices according to claim 20, described policy store is in policy store equipment, and described policy store equipment is arranged in memory.

22. devices according to claim 20, wherein, according to described strategy and definite time interval to disturb measure.

23. devices according to claim 18 wherein, carry out arithmetic average to interference metric in frequency resource.

24. devices according to claim 18 wherein, carry out geometric average to interference metric in frequency resource.

25. devices according to claim 18 wherein, carry out harmonic average to interference metric in frequency resource.

26. devices according to claim 18, wherein, send described strategy to multiple different sectors by backhaul network communication.

27. devices according to claim 20, wherein, described strategy becomes interference metric threshold value while comprising.

28. 1 kinds contribute to the method for the power control in wireless communication system, and described method comprises:

At mobile terminal place reception sources from one group of sector and the load designator of any generation according to claim 1-17;

Know the fractional frequency reuse pattern being used by non-serving sector, so that the load designator corresponding with this non-serving sector decoded, described non-serving sector has highest signal and interference and noise ratio and operates in the frequency band of distributing to mobile terminal, wherein in the time that described decoded load designator shows that interference metric exceedes threshold value, the state of this load designator is true, and in the time that described decoded load designator shows that interference metric does not exceed threshold value, the state of this load designator is false, described threshold value is the mean value of one group of threshold value being associated with the frequency band of distributing to described mobile terminal, and

According to the state of described decoded load designator, adjust the transmitted power of described mobile terminal.

29. methods according to claim 28, wherein distribute to the described frequency band of mobile terminal and are indicated by received fractional frequency reuse pattern.

30. methods according to claim 28, wherein said mean value is at least one in following mean value: arithmetic mean, harmonic-mean or geometrical mean.

31. methods according to claim 28, become when the wherein said one group of threshold value being associated with the frequency band of distributing to described mobile terminal is.

32. methods according to claim 28, the wherein said one group of threshold value being associated with the frequency band of distributing to described mobile terminal is set up by a strategy.

33. methods according to claim 32, wherein said strategy is determined by described non-serving sector and is that sector is distinctive.

34. methods according to claim 28, the step of wherein adjusting the transmitted power of described terminal according to the state of described decoded load designator comprise when described state be that true time reduces described transmitted power.

35. methods according to claim 28, the step of wherein adjusting the transmitted power of described terminal according to the state of described decoded load designator comprise when described state be that fictitious time increases described transmitted power.

36. methods according to claim 34, the step that wherein reduces described transmitted power comprises the current transmitted power predetermined offset Δ P that successively decreases ₀.

37. methods according to claim 34, the step that wherein reduces described transmitted power comprises adjusts offset Δ P (I) by current transmitted power decreasing power, and described power is adjusted offset Δ P (I) and at least depended on the interference metric values I being associated with described decoded load designator.

38. according to the method described in claim 37, wherein, Δ P (I) is that the application-specific based on being carried out by described terminal is inferred at least in part, described application program comprise that wireless network goes to bank or internet browsing or search at least one.

39. according to the method described in claim 38, and wherein, Δ P (I) is that the particular data sending based on described terminal is at least in part inferred.

40. methods according to claim 28, the step of adjusting the transmitted power of described terminal according to the state of described decoded load designator comprises employing close loop control circuit.

41. 1 kinds of devices that operate in wireless communications environment, described device comprises:

For receive the module of the load designator being associated with the size of interference metric at mobile terminal place, described load designator is derived from non-serving sector and according to any generation in claim 1-17;

For knowing the module of the fractional frequency reuse pattern being used by non-serving sector so that the load designator corresponding with non-serving sector decoded, described non-serving sector has highest signal and interference and noise ratio and operates in the fractional frequency reuse of distributing to mobile terminal, wherein in the time that described decoded load designator shows that interference metric exceedes threshold value, the state of this decoded load designator is true, and in the time that described decoded load designator shows that interference metric does not exceed threshold value, the state of this load designator is false, described threshold value is the mean value of one group of threshold value being associated with the frequency band of distributing to described mobile terminal, and

For according to the state of described decoded load designator, adjust the module of the transmit power spectral density of described mobile terminal.

42. according to the device described in claim 41, wherein

The transmit power spectral density of adjusting described mobile terminal comprises: the transmitted power that reduces described mobile terminal in the time that the value of described decoded load designator shows that interference metric in described non-serving sector exceedes threshold value, and in the time that the value of described decoded load designator shows that interference metric in described non-serving sector does not exceed threshold value, increase the transmitted power of described mobile terminal.

43. according to the device described in claim 42, wherein, the power that reduces described mobile terminal comprises that described offset Δ P (I) depends on the size of the interference metric in described non-serving sector by current transmitted power minimizing offset Δ P (I).

44. according to the device described in claim 43, and wherein, the transmitted power that increases described mobile terminal comprises current transmitted power is increased progressively to predetermined offset Δ P ₀.